Abstract
Field studies were conducted to assess the mineral nutrition and growth of Colorado spruce (Picea pungens Engln) seedlings (2–4 yr) from provenances selected for superior growth on calcareous prairie soils. Tissue nutrient concentrations and response to nitrogen were determined by use of foliar analysis and growth pattern studies. Soil conditions ranged from 7.6–7.8 for pH, 12–23% for total CaCO3, and 5–6% for active CaCO3. Foliage mineral composition showed relatively low phosphorus (0.09–0.15%) and high calcium (0.45–1.52%) assimilation. Seasonal growth and seedling response to added nitrogen was not adversely affected by the calcareous soil condition. Levels of nitrogen in the foliage required for optimum growth ranged from 1.5–2.0% and were similar to that of other conifer species.
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